fix: add global typography font size migration

Author: Arukuen

src/plugins/global-settings/preset-controls/index.php

@@ -44,6 +44,7 @@ class Stackable_Size_And_Spacing_Preset_Controls {
   		function __construct() {
 			add_action( 'register_stackable_global_settings', array( $this, 'register_use_size_presets_by_default' ) );
 			add_action( 'stackable_early_version_upgraded',  array( $this, 'use_size_presets_by_default_set_default' ), 10, 2 );
+			add_action( 'stackable_early_version_upgraded',  array( $this, 'migrate_global_typography_font_size' ), 10, 2 );
 			add_filter( 'stackable_js_settings', array( $this, 'add_setting' ) );
 
 			add_filter( 'stackable_inline_styles_nodep', array( $this, 'add_preset_controls_styles' ) );
@@ -79,6 +80,41 @@ public function use_size_presets_by_default_set_default( $old_version, $new_vers
 			}
 		}
 
+		/**
+		 * Migrates global typography font sizes from numbers to strings 
+		 * when upgrading to v3.16.0 and above
+		 *
+		 * @since 3.16.0
+		 */
+		public function migrate_global_typography_font_size( $old_version, $new_version ) {
+			$typography_option = get_option( 'stackable_global_typography' );
+
+			if ( ! empty( $old_version ) && version_compare( $old_version, "3.16.0", "<" )
+				&& ! empty( $typography_option ) && isset( $typography_option[ 0 ] )
+			) {
+				$typography = $typography_option[ 0 ];
+				$updated = false;
+
+				foreach ( $typography as $key => $item ) {
+					if ( ! is_array( $item ) ) {
+						continue;
+					}
+
+					foreach ( [ 'fontSize', 'tabletFontSize', 'mobileFontSize' ] as $size_key ) {
+						if ( isset( $item[ $size_key ] ) && is_numeric( $item[ $size_key ] ) ) {
+							$typography[ $key ][ $size_key ] = strval( $item[ $size_key ] );
+							$updated = true;
+						}
+					}
+				}
+
+				if ( $updated ) {
+					$typography_option[ 0 ] = $typography;
+					update_option( 'stackable_global_typography', $typography_option );
+				}
+			}
+		}
+
 		// Make the setting available in the editor
 		public function add_setting( $settings ) {
 			$settings['stackable_use_size_presets_by_default'] = get_option( 'stackable_use_size_presets_by_default' );